Nozzle for shoe coating machines



@et 69 i936. vv. L.. MacKENzlE 2,056,325

A NOZZLE FOR SHOE COATING MACHINES Filed March 20, 1955 W, mum

Patented Oct. 6, 1936 PATENT OFFICE I NOZZLE' FOR SHOE COATING MACHINES rWilburl L. MacKenzie, Beverly, Mass., assigner to United` Shoe Machinery Corporation, Paterson, N. J., a corporationof New Jersey Application March zo, 1935, serial No. 12,031

2 Claims.

- VThis invention relates -tol nozzles and is illustrated hereinr as embodied in a shoe coating machine of the'extruding type. Such nozzles find l one: application in Amachines designed particularly to -apply marginal bands of cement to the bottoms of shoes prior to the application of the soles When, in making shoes of the type in which the sole is attached to the upperchiefiy or exclusively byvmeans of cement, itis desired to apply a marginalband tothe overlasted upper, for example, along the irregular and rough surface of the shoe bottom', it has been found desirable to employ an extruding nozzle of flexible material, such as rubber, in order that there may be good contact between the nozzle and the work, and in order that the'cement may be applied in uniform quantities and alonga vband of uniform width. It is sometimes desired to'employ such machines for the application of cements which contain materials deleterious to rubber so that the rubber nozzles have deteriorated rapidly.

f Accordingly, an object of the invention is to provide "an improved nozzle for a shoe coating 25 machine of the extruding'type which will, while retaining'the qualities of flexibility andresist' ance to wear found in rubbernozzles, be unaffectcause a rapid deterioration of rubber.

The illustrated embodiment 'of aV nozzle embodying my invention hasfa surface coating of "Thiokol. Thiokol is a material having a rubber-like consistency and is composed mainly of combined sulphur derived from the interaction ofv compounds of olens with soluble polysulphide (e.'g., ethylene dichloride and sodium polysulphide) Y In the drawing, Y

Fig. l` is a side elevation of a 'portion of a machine in `which my improvedlnozzl'e has been embodied for the sake of illustration;

, Fig. '2 isa substantially full sized view of the nozzle viewed in the opposite direction from'Fig. 1 and showing a portion of its holder;

Fig.l 3 is a side elevation of the nozzle, and

Fig. 4 is a longitudinal section through the nozzle shown much enlarged.

To -aid in understanding the manner of use of a nozzle constructed in accordance with my invention, I have shown it as embodied in a machine for applying a coating of cement to the margin ofthe bottom of a shoe prior to the application ofa sole thereto and more fully disclosed in my prior application Serial No. 754,648, filed Novem- 55lber24, 1934. When a rubber nozzle of this kind is used for some sorts of cement, which contain solvents or other materials which attack and cause a rapid deterioration of rubber, then it is necessary to Vprovide a nozzle which will resist the solvent embodied in such cements and I have, therefore, illustratively shown the nozzle, as covered or lined with Thiokol. One example of such a cement is one made principally from dissolved DuPrene. Many of the solvents contained in DuPrene cements attack rubber. The material known commercially as DuPrene is a polymerized chloroprene and may be made by the method of polymerizing set forth in Letters Patent of the United States No, 1,950,436, granted March 13, 1934, upon an application of Ira Williams.

In general, the machine comprises a nozzle I0 through Which a coating material, such as cement, is supplied under pressure. The cement isfed to the nozzle through a flexible hose I2 leading to pipe fittings I4 to which is fastened a gage I6 and which embody a turn valve I8. Associated with the nozzle is a rubber-tired feed Wheel which is movably mounted upon a carrier 22 supported in a frame 24. The arrangement is Such that an operator holding a shoe S in iriverted, substantially horizontal position presents that portion of the bottom of the shoe adjacent to the heel breast line to the nozzle I0, and by depressing a suitable treadle (not shown) moves the feed vwheel 20 into the position shown in Fig. 1 where the wheel is in contact with the side of the shoe, and also opens the valve I8 to allow a flow of cement through the nozzle. The rotation of the driven feed wheel 20 causes a progressive movement of the shoe which is guided by the operator' to present to the nozzle the margin of the bottom o'f the shoe around the toe end thereof back to a corresponding point on the other side of the shoe with the result that there is applied a marginal band of cement to the overlasted upper 26. The machine may also be used for shoes having a welt y W and a springheel lift H, as shown in Fig. 3, and, when thus employed, the machine willinclude a Welt supporting member 28.

Mounted in the frame 24 is a nozzle supporting leverv having a depending rear end 32 carried upon a cross pivot 34. Upward tilting movement of the nozzle supporting lever 30 is opposed by a spring 36 interposed between a lug 38 on the lever and a fixed lugv 40 on the frame. The normal lowermost position of the lever is determined by means of a screw 42 threaded in'a'ange 44 on the lever and contacting' with a flange 4B on the side of the frame.

The nozzle`| is held upon the lower end of an arm 50 by means of a clamp plate 52 and this arm is held in the desired angular position upon a supporting rod 54 attached to the lever 30 by means of pinch screws 56 passing through a split portion of the arm. The rod 54 is mounted for axial adjustment in the outer end of the lever 30, being guided by the pointed end of a set screw 58 which cooperates with a V-shaped groove 60 in the rod and which, when screwed down, serves to clamp the rod against both axial and turning movement. Y

The feed roll 20 mounted in the pivoted carrier 22 is driven by means of interconnected shafts 62 and is moved outwardly by the operator until an arm 64 on the carrier 22 engages the inturned end 66 of an adjustably mounted stop bar 68.

Opening and closing of the valve |8 is effected by actuation of a valve rod journaled'in a bracket l2 which is a part of the carrier lever v30. This valve rod 10 isconnected to the valve I8 through universal joints 14 so that the actuation of the valve is not affected by adjustments of the position of the nozzle carrying arm 50. Turning movement of the valve rod 10 is secured by pullinga rod 16 attached to a lever 18 which is secured to the'valve rod. It is desired that the feed roll shall be moved out into position before the valve is opened and vice versa, and this is accomplished in the illustrated machine by a treadle (not shown) connected to a treadle rod 80. 'Ihe v is subjected to repeated distortions as successive shoes are presented to the nozzle, and during the traversing movement of a single shoe it is flexed up and down and sidewise because of the uneven character of the bottom of a shoe, in which the shank portion is not in the same plane as the for-spart and is connected to the forepart by a portion of double curvature adjacent to the ball line. In order that the nozzle may not be unduly distorted, and to facilitate its movement over the work and retention in the desired position upon the work, there may be associated with the nozzle a skid finger 90, best shown in Fig. 3, which aids the nozzle in riding over the edge of a spring heel lift H and also limits the upward pressure which the operator may apply to the nozzle. At

the shank portions of shoes, such as the shoe S illustrated in transverse cross section in Fig. 2, thev overlasted upper'26 is close to a metal shank member 92 which may, as shown, be ridged.

^` When the nozzle passes over such a portion of the shoe, it is twisted and distorted, as indicated somewhat in Fig. 2,' and, in order that it may not be laterally Ydeflectedv beyond the outer margin of the area which is to be coated, there may be associated with the nozzle a side finger 94.

the fiexibility of the illustrated nozzle, as compared to a nozzle of the somewhat stiffer, pure Thiokol, it is composed of a rubber body portion |02 of such composition as will, when provided with a lining or covering |04 of Thiokol, gives the desired flexibility.

Such a construction is illustrated upon a greatly enlarged scale in Fig. 4, where the nozzle has a body portion |02 mounted upona metal tube |00 forming a, part of the nozzle supporting mechanism illustrated in Fig. 1.

l. Thus, I have devised a nozzle construction in which the flexibility, as determined by the usual and well known durometer test, is substantially the same as that of rubber of a quality which has been found successful for nozzles used in the application of pyroxylin cements and which, at the same time, is protected from the deleterious effect of the solvents or other materials embodied 'in cements of the type of that known as DuPrene-, by having a surface, coating of Thiokol over at least those portions of the nozzle which are particularly exposed to the action of the cement and, preferably, over the whole inner and outer surfaces of the nozzle.

The tapered end portion of the illustrated nozzle is provided with a series of capillary outlet passages |06 (of which only one is shown) and with a thinner, flattened tip portion |08 adapted to drag upon the work to the rearof the outlets of the passages where they merge into a recess defined by lateral flanges ||0 (Fig. 2) and provided upon its inner upper'surface with a series of ridges H2. It will be noted that not only the hollow body portion but also the interior passages |06 are lined with Thiokol in the construction illustrated in Fig. 4. The nozzle is, therefore, protected against the action of the solvents of the cement which may be employed. It is intended that the nozzle shall bear against the work at a heel portion |I4 and that a tip portion |08 shall be held against the work byA integral ribs ||6 which may, in certain forms of the nozzle, be interconnectedby a terminalrib I8. As herein shown, the greaterportion of the tip |08 including the recess ||0, the heel ||4 and the ribs ||6 and ||8 are formed of athicker portion of Thiokol. which is joined with a Thiokol covering |20 extending over the whole outer surface of' the nozzle, to give it still further protection.

When a shoe is presented to the nozzle and cement of the character above described is applied to the peripheral margin of the bottom of the shoe, then the nozzle will drag over the overlasted margin 26 of the upper or over the welt W and spring heel lift H, according to the construction of the shoe. It will, by reason of the construction employed, bend and twist inany desired fashion and at the same time will have sufficient mechanical strength to resist the wear provided by therubbing of the shoe.

Having thus describedmy invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A `flexible nozzle adapted to be applied to a shoe bottom cementing machine on which there is a hollow tube through which cement is extruded, said nozzle comprising a body portion adapted to vbe positioned upon the hollow tube and a flexible, resilient rubber tip portion provided with a recess the open side of which is adapted for contact with the Work, said tip portion also having passageways extending between the recess and the body portion to permit the cement to be extruded directly into contactwith 75;.

the irregular and rough margin of the bottom of a shoe, said passageways and said recess being lined with thiokol to offset the corrosive and deteriorating action of the cement Without destroying the exibility and resilience of the tip portion of the nozzle.

2. A flexible nozzle for use in a shoe bottom cementing machine in which the cement is extruded into direct contact with the irregular, rough margin of a shoe bottom to form a stripe thereon, said nozzle comprising a hollow body portion and a thinner and iiatter resilient tip portion, at one side of which passageways through the nozzle emerge, said passageways being lined with a solvent-resisting material containing a large percentage of thiokol, the tip portion of said nozzle having a portion of rubber thereby to impart to the nozzle the desired resilience and to strengthen the nozzle against twisting strains, the side of the attened tip portion which does not contact with the work being provided with longitudinal ribs of stiffer material, such as has been used for protecting the passageways of the nozzle, and arranged to resist deection of the tip portion.

WILBUR L. MACKENZIE. 

